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. 2011 Mar 25;6(3):e17930. doi: 10.1371/journal.pone.0017930

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Evans et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Primary Care Trusts (PCTs) are regional NHS organizations in England that provide primary and community care. The city of Wolverhampton where the focused epidemiological investigation was undertaken is highlighted in yellow. The postcode map was produced under license by ©Crown Copyright and database right 2010. Ordnance Survey License 100016969/100022432.